Institute Newton C. Braga

Circuit Bench

Two-Stage IF Amplifier (CB22242E)
This circuit that equipped many transistor radios from the 50's was found in an American...
Simplified Alarm (CB16418E)
We found this simple alarm circuit in a 1981 documentation. As we can see, it is a car alarm...
Unijunction Frequency Divider (CB1254E)
The unijunction transistors used in this circuit are uncommon, but equivalents like the 2N2646 can...